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The vernier scale of a travelling microscope has 50 division which coincide with 49 main scale division. If each main scale division is 0.5 mm, calculate the minimum inaccuracy in the measurement of distance.

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Minimum inaccuracy = Vernier constant
= 1 MSD – 1 VS.D
= 1 MSD – `(49)/(50)` MSD
`=(1)/(50)(0.5mm)=0.01mm`
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